Terrazzo



Apr-il 16, 1935.

'Patented Apr. 16, 1935 UNITED STATES PATENT orrlcfE.-

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TERBAZZG Willis A. Vogel, Toledo, hio Application November 23, 1934, Serial No.. i54g441 i invention relates to construction mater This invention has utility when incorporated in terrazzo surfaces.

Referring to the drawing: y Fig. 1 is a section through a lower corner of a structure having a decorative terrazzo covering;

Fig. 2 is a plan view of a section of terrazzo emfeatures of the invention herein;

Fig. 3 is a view on the line III-III, Fig. 2,'

Fig. 4 is a perspective view of a section of a pre-formed decorative strip of the invention herein', showing eatures of interlocking;

Fig. 5 is a plan view of a pre-formed decorative strip embodying a modiiied interlocking means;

Fig. 6 is a section on the line VIv-VI, Fig. 5,'

Fig. 7 is a section through a multi-strip decorative unit; and

Fig. 8 is a view similar to Fig. 4 showing a modined form of interlocking means.

In the installation of terrano, the necessary work performed is greatly facilitated by the use oi' pre-formed construction units oi the invena tion herein, and at the same time the beauty of the finished work is enhanced and intained. Decorative umts produced by the invention herein become such an integral part of the entire terrazzo body that the resulting surface appears to be one continuous terrazzo unit, while still wir taining the artistic designs which may be laid out therein.

The entire terrazzo body is maintained tree from cracking or shrinkage, especially around the out or the decorative units. Furthermore, means are provided for anchoring the various decorative units with the support so that there is freedom from loosening of even small inserts. 4In addition thereto, the coloring of the surface and the inserts can be blended more desirably.

Primary support l has sub-grade coating or foundation 2 of cementitious material ft. thereon and allowed todry suiliciently that it if support the load or workmen ope i thereon to lay the terrazzo and yet be soft enough to res ceive the interlocking means employed between this coating and the terrazzo. Final hardening of this `foundation 2 then serves to permanently lock the ilnish terrazzo coat with its decorative units thereto. Wherein the decora tive'coatin'gis to'ext'end over a wall as well as upon a door, scratch coat oi plaster t y be proc vided to which the nnished decorative surta@ usr-f be attached 'in a like fn nier. of the surface coating of terr w is peter n1.. d the decorative units may he preformed to comprise a corner strip 4, a wainscot 'cap 5, a decorative unit 6, medallion "l, or any other decorative or construction form desired. To this end, it has been found that the body of these units should preferably be of a hardness 5 comparable with the hardness of the finished terrazzo in which these bodies may serve as inlays, borders or other construction units. A plastic may be used, preferably rubber vulcanized to such a hardness.

The hardness is preferably of the standard of 90 to 95 as compared to a standard of 100 for steel when measured by a rubber hardness testing device known as a durometer. `With the preformed bodies of this hardness, such may be placed 15 into position by various fastening means hereinafter described and the terrazzo body 8 cast upon the sub-coat 2 to the desired thickness.

In practice, when this terrazzo coating has set sumciently, the grinding or polishing operation 2o takes place, and the material of the pre-formed bodies is ground and polished simultaneously with the terrazzo body 8 to form a continuous smooth surface. The material, as herein disclosed, being of a comparable hardness with the o, a continuous smooth door results without excessive wearing away of the decorative bodies and at the same time such do not chip to become pitted by this operation. Also, the resulting terrazzo is not ected by continuous cleaning operations even 3o though strong acids or alkali are employed.

The decorative bodies may be v: =f fa with aggregate which may be either ule, p or dust, of terrazzo or other minerals; the impregnating particles being in some instances of the 435 w size as the surrounding terrazzo im so that, on completion of the door, a continuous unbroken terrazzo extent is provided. By impregnating the decorative bodies, the plastic` presents a color identical with the surrounding body or :aoontrasting color as desired, and the particlesn of aggregate at the surface oi the decorative strips prevent excessive `vvear thereof.

in the molg or extruding oi the pre-formed shapes, the aggregate with which the fl-ies are impregnated may extend throughout the be ww-o to the ex surface in the ...1, P

coating.

e decorative units may have a wide range of appence. For example, the medallion l herein may have its main portion vulcanized iw pre :i :l with particles oi rubber of a ctr ind color and additionally it ay have @en pocket Q which may be lled with te w .il it a g5 5 genic plastic pre-molded rigid meuse@ @E heving an approximate equivalent surface herd ness throughout.

i0. A terrazzo surface including e liner ush with said surface, said liner comprising en or- ,.wl-o r 0f and form-retaining properties approximately equal with the terrazzo for maintaining surface homogeneity in service.

il. A terrazzo surface, a, pre-formed molded io decorative insert therein tempered to match the durability of said terrazzo, und means interlocking said inserts with the terrazzo.

12. The combination of a terrazzo surface, huving u quality of duredbility, a. decorative insert comprising a. pre-molded unit tempered to match the durability of the terr, seid deco rative unit including means interlocking` said unit with the terrazzo. 

